Verified Solution • 2025–26 Session moderate

QAIPMT-2010-Ph-1965: NEET 2010 Physics - Class 12 AIPMT-2010-Ph-1965 Solution: For transistor action (1) Base emitter and collector regions…

For transistor action (1) Base emitter and collector regions should have similar size and doping concentrations. (2) The base region must be very thin and lightly doped. (3) The emitter-base junction is forward biased and base-collector junction is reverse biased. (4) Both the emitter-base junction as well as the base-collector junction are forward biased. Which one of the following pairs of statements is correct? (4) and (1) (1) and (2) (2) and (3) (3) and (4)

Multiple Choice Options

  • A μ0i22R{{{\mu _0}i} \over {2\sqrt 2 R}} 2 2 _ R _ 0 _ i _
  • B μ0i2R{{{\mu _0}i} \over {2R}} 2 R _ 0 _ i _
  • C μ0i4R{{{\mu _0}i} \over {4R}} 4 R _ 0 _ i _
  • D μ0i2R{{{\mu _0}i} \over {\sqrt 2 R}} 2 _ R _ 0 _ i _

Step-by-Step Verified Solution

Magnetic fields due to the two parts at their common centre are respectively, B y = _ 0 i 4 R and B z = _ 0 i 4 R Resultant field = B y 2 + B z 2 = ( _ 0 i 4 R ) 2 + ( _ 0 i 4 R ) 2 = 2 _ 0 i 4 R = _ 0 i 2 2 R

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